Hello,
Is it possible to retrieve size of unwind information from an object file for a particular function?
object::computeSymbolSizes computes sizes without unwind info
Unwind information (on ELF at least, don't know about Mach-O or COFF) is stored in a separate section and in a format that isn't strictly compatible with functions (FDEs in .eh_frame are built on PC ranges). As far as I'm aware, there's no LLVM code to parse the .eh_frame section, so you'd have to do it yourself.